NIST Develops Advanced Ac-dc Difference Measurement Techniques
The National Institute of Standards and Technology (NIST) has been developing advanced measurement techniques for ac-dc difference measurements and dc voltage metrology through its Ac-dc Difference Project. These techniques employ both quantum standards and novel fabrication methods to improve accuracy and reliability.
Key Developments:
– Multijunction Thermal Converters (MJTCs) using semiconductor fabrication techniques offer uncertainties of about 5×10-7 or less in audio frequencies
– High-frequency MJTCs on quartz substrates are being used in measurement services
– High-current MJTCs capable of handling up to 10 A are under development
– Quantum-based ac-dc difference measurements using Josephson Arbitrary Waveform Synthesizers (JAWS) promise further uncertainty reductions
Impact on Quantum Technologies:
– Improved ac-dc difference measurements are crucial for accurate calibration of quantum devices
– Quantum-based standards like JAWS Voltage Standards could revolutionize voltage metrology
– Advanced MJTCs and photonics-based thermal converters may enable new quantum measurement techniques
Implementation Timeline:
– Current status: High-frequency MJTCs already in use, high-current MJTCs under development
– Next-generation artifact standards and quantum-based measurements in research phase
– Commercial availability through NIST Standard Reference Instruments program
The NIST Ac-dc Difference Project is at the forefront of developing cutting-edge measurement techniques for ac-dc difference and dc voltage metrology. By leveraging both traditional thermal converter technology and emerging quantum standards, NIST aims to significantly improve the accuracy and reliability of these critical measurements. The project’s work has already begun to impact quantum technologies through improved calibration and measurement capabilities, with further advancements expected in the near future.
Source: https://www.nist.gov/programs-projects/ac-dc-difference
Keywords: Thermal, Calibration, Metrology, Quantum, Josephson
